I like the lateral thinking involved here and even more the mad genius in trying it out. It got me thinking that I might try putting magnets on a disk driven by the back wheel of my bike with a metal.plate under my seat. Ah, the luxury of a heated bike seat when cycling in the rain and snow!And then again, I might not, just in case it overheats going downhill. I wouldn't want to explain hiw I got a burnt bum in A&E.

Some apparently aluminium (and copper) pans do work, but in reality they have a core of a suitable magnetic metal layer embedded in the base. Similarly, not all stainless steel pans work because not all types of stainless steel are magnetic. You can test if something will work on an induction hob by seeing if a magnet sticks to out.OnYou can also buy a flat heating disk which you place on top of the induction hob which turns it in to a hot plate for using with non-magnetic or glass cookware although it's obviously easier just to buy induction capable pans.

I really like both the idea and your final piece. Regarding the two nicks on the front which you dislike, I would leave them there. They provide both a bit of character and a narrative to the history of the piece. Perfection sometimes means not being perfect. If you do fill them, consider using a contrasting wood or even a brass or copper infill.

Great design!It would also make a great design for an Amazon Echo Dot holder whilst possibly also increasing the sound quality.The old version 2 Dot has a really odd way to throw out the sound, through a narrow slot somewhere on the bottom rim near the front. You can find the location easy enough just by running your thumb around until the sound stops. I've experimented with putting the Echo Dot on an upside down solid plastic plant pot with a 1cm hole in line with that point and the rim sealed to the plant post, which I then line with foam and placed a couple of 15mm holes in the sides for the sound to come out through. The result was a much better sound, less tinny and a bit more mellow.The new version 3 Dot though has a much better sound and the speaker seems to have a much bigger ex...

Great design!It would also make a great design for an Amazon Echo Dot holder whilst possibly also increasing the sound quality.The old version 2 Dot has a really odd way to throw out the sound, through a narrow slot somewhere on the bottom rim near the front. You can find the location easy enough just by running your thumb around until the sound stops. I've experimented with putting the Echo Dot on an upside down solid plastic plant pot with a 1cm hole in line with that point and the rim sealed to the plant post, which I then line with foam and placed a couple of 15mm holes in the sides for the sound to come out through. The result was a much better sound, less tinny and a bit more mellow.The new version 3 Dot though has a much better sound and the speaker seems to have a much bigger exit on the sides so that wouldn't work.

The chest strap is a good call! It's another little thing that make a pack so much more stable and comfortable, stopping the pack pulling so much on the shoulders. It makes you wonder why it wasn't thought of sooner, it seems to be a relatively new innovation given how long rucsacs have been around. I even fit one to small packs if it's not got one.

I remember having the aluminium equivalent to this in the 70s with a curved ledge at the bottom. It was very lightweight and great for carrying loads. However, it had screwed joints and they were a bjt kf a pain, always working loose as the pack flexed. Hkwver, my next pack with an inner frame was so much better due to one thing mentioned here- the hip belt.I'm fairly certain, if it was possible to attach a hip belt effectively to these frames someone would have done so a long time ago as it made such a difference to carrying heavy loads.Maybe with carbon fibre you could make a hybid, an external frame but with an ergonomic shape and fit with a hip belt attachment system?

The one thing this cheap compass has that the most expensive new compass won't have is the memory it will bring back to you of your grandfather every time you use it. That is worth much more than accuracy or a better build.Plus, it might have been cheap, but it's lasted long enough.

Great idea! I have an electric bike and don't want to mess aroumd with extra batteries, but this is a great way to keep the power on tbe forks, not the wheels.However, instead of painting I looked up glow in the dark spoke on Amazon and it came up with beads you attach to the spokes. I like the idea of putting tbese on spokes and shining uv leds on to them, so I'll put this on my "projects to do" list.Thanks for the idea!

I like the idea of designing this so it looks like it's climbing down the lead hanging from a standard ceiling light socket. As I'm always wary of wood near incandescent bulbs and also because it's exposed, I'd use the LED equivalent of that type of bulb.

Interestingly, I'm just about to update my system. I've just bought a Shimano dynamo hub. I am planning on basing my system on 5v as the dynamo is 6v 3W. I will be using Schottky diodes in a bridge rectifier feeding into a 4xC type NiMh battery pack @3.6Ah total. Off this I will be taking the lights and a USB connector for charging phones or tablets and adding another optional mains adaptor charging socket.I've decided to go for this as sometimes I go out bike touring and keeping a phone charged is a problem. I was originally looking at carrying a solar charger but here in the UK it's not too reliable. Plus, the battery pack will be being charging even when I'm not actually using it so I will also always have lights and can then charge the phone off it even if I'm not riding. I am also ...

Interestingly, I'm just about to update my system. I've just bought a Shimano dynamo hub. I am planning on basing my system on 5v as the dynamo is 6v 3W. I will be using Schottky diodes in a bridge rectifier feeding into a 4xC type NiMh battery pack @3.6Ah total. Off this I will be taking the lights and a USB connector for charging phones or tablets and adding another optional mains adaptor charging socket.I've decided to go for this as sometimes I go out bike touring and keeping a phone charged is a problem. I was originally looking at carrying a solar charger but here in the UK it's not too reliable. Plus, the battery pack will be being charging even when I'm not actually using it so I will also always have lights and can then charge the phone off it even if I'm not riding. I am also thinking of using a single Schottky diode feeding into the lights or a couple of separate lights front and back so they will always be on whenever I cycle.

I make these camping. They aren't the best of breads but they have the advantage that you just carry the raw material and add water and they can be cooked on a frying pan or even over an open fire. You can make them more tasty by adding sultanas, raisons or similar. Alternatively, make it in to beer bread by adding beer into the mix to give it a bit of lift. The other advantage of doing beer bread is it doesn't take a full bottle or can but once it's opened you don't want to waste it, do you?

Brilliant costume! It reminded me of seeing the Liverpool Giants Diver which commemorated the 100th anniversary of the Titanic sinking in 2012. It was done by a French street theatre company Royal de Luxe and was absolutely mind blowing. It was of course slightly larger than yours at 15m/50ft. You can see it coming out of the Albert Docks here and setting off across the city looking for his niece and her dog:C'est incroyable!

Thanks. I presume you mean the other slow watch when you say expensive! However, that in itself was a copy of the original mechanical clocks which only had an hour hand as the mechanisms weren't accurate enough to keep minutes and at that time minutes were less important to life than the hours. Eventually in the late 17th century the use of a pendulum allowed more accurate timekeeping and the minute hand was added. I'm just completing a time loop back to before 1690.You'll find more details in the referenced Wiki:https://en.wikipedia.org/wiki/Clock_face#Historica...As the saying goes, there's nothing new under the sun.

I only found the video, I was not the maker of them. However, going back to the original YouTube video, they referenced here for details of the sphericon:http://www.thingiverse.com/thing:112367It also led to this, a singing oloid, which I found quite hypnotic:http://www.youtube.com/watch?v=2d2RchtzD-4

I only found the video, I was not the maker of them. However, going back to the original YouTube video, they referenced here for details of the sphericon:http://www.thingiverse.com/thing:112367It also led to this, a singing oloid, which I found quite hypnotic:www.youtube.com/watch?v=2d2RchtzD-4

I only found the video, I was not the maker of them. However, going back to the original YouTube video, they referenced here for details of the sphericon:http://www.thingiverse.com/thing:112367

just read this. My post is about being able to keep a list of different passwords in a secure way. Using the same pass phrase across many sites isn't secure. If I have to substitute numbers in the passphrase to keep it more secure, how do I record/remember all the different passwords? That's the problem I'm trying to deal with here.Finally, using an encrypted password database is ok on one machine, but I use different machines and I find this easy to do. I could even use somebody else's machine if I wanted (although I wouldn't trust it!).

It lets me keep a written record of the many passwords I seem to be accruing in a book. I use different passwords for all of the different sites I use for security. However, writing down passwords isn't exactly secure, so the unique missing secret word, which is personally easy to remember and I don't need to write down acts as a security feature for the written down passwords. If the extra word isn't present, the written passwords won't work. Hope that makes sense.

To see how a real capacitor works, why not repeat the experiment with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will not change or decay. To make it decay, put a resister across the capacitor (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voltage to half the voltage. Time it and see e.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 45 seconds from 6.5v to 3.2...

To see how a real capacitor works, why not repeat the experiment with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will not change or decay. To make it decay, put a resister across the capacitor (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voltage to half the voltage. Time it and see e.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 45 seconds from 6.5v to 3.25v. The decay time is a function of the capacitor size and the resistor size. Look up why on the web by looking up "RC decay".Try it first using maybe a 100uF cap and a 1megohm resistor. Then make the cap bigger or smaller and see what happens (maybe double it) or make the R smaller or bigger and see what happens.ref:http://www.electronics-tutorials.ws/rc/rc_2.html

oops done the above reply on a tablet!lots of errors! Will edit later on laptop so ignore above until I've sorted it! Damned auto correct! Apologies!

Unfortunately your physics teacher doesn't know what he is talking about. I have explained fully in my previous references, I'd suggest you talk to either a local radio ham or trained electronics person who actually understands the difference between a battery/cell and a capacitor/condenser. Also, do a Google search for how capacitors work, there are lots of sites which will give you a good overview.

I don't know why you keep insisting this is a capacitor. What you have made is actually one of the first electric cells, a Galvanic or Voltaic Cell, named after their inventors. See the reference for further details and for a fuller explanation of how they work. If this was a capacitor it would work with both electrodes having the same material, which this design will not do.You also seem to not understand about how a capacitor would actually discharge if you were measuring it using a voltmeter. A charged capacitor will discharge through a load with an exponential decay. It will continue to decay. It will not drop down and then stop at a certain value, it will continue to decay to lower and lower voltages.ref:https://en.wikipedia.org/wiki/Galvanic_cell

To see how a real capacitor works, why not repeat the experienced Kent with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will is fly change or decay. To make it decay, put a resister across it (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voyage to half the voltage. Time it and see! E.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 6.5v to 3.25v. The decay time...

To see how a real capacitor works, why not repeat the experienced Kent with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will is fly change or decay. To make it decay, put a resister across it (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voyage to half the voltage. Time it and see! E.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 6.5v to 3.25v. The decay time is a function of the capacitor size and the resistor size. Look up why on the web!

I thought the same about it lighting up when you got up at night. I was thinking of some kind of weight sensor but it would be difficult to implement I suspect, especially for two people. Your idea sounds much better.

Nice Instructable. If you've engraved the back, is that the silvered or non-silvered side? (from your Instructable it seems like it's the non-mirrored side). If so, as you only show pics of it back lit and effectively showing through, I assume you could put a card back or have it on a wall and the writing only appears when lit? I fancy using this idea some time with a batman logo or maybe an alien but like the idea of it only appearing when you light up the mirror. It might also make a good Spiderman light for my great nephew! I hope I have the time to implement my ideas!If you can't get acrylic mirror sheet or you want to add this effect to a mirror you've already got I suspect you can do what you did but with just normal acrylic sheet and put a mirror behind but you'd possibly lose th...

Nice Instructable. If you've engraved the back, is that the silvered or non-silvered side? (from your Instructable it seems like it's the non-mirrored side). If so, as you only show pics of it back lit and effectively showing through, I assume you could put a card back or have it on a wall and the writing only appears when lit? I fancy using this idea some time with a batman logo or maybe an alien but like the idea of it only appearing when you light up the mirror. It might also make a good Spiderman light for my great nephew! I hope I have the time to implement my ideas!If you can't get acrylic mirror sheet or you want to add this effect to a mirror you've already got I suspect you can do what you did but with just normal acrylic sheet and put a mirror behind but you'd possibly lose the hidden until lit effect. You could even get a bit of doubling on the lit image by placing the mirror further back.

It would have been a better Instructable with an explanation of what the ph values mean, both generally and in terms of dental health. There is a good table of common drinks ph's shown here:http://www.21stcenturydental.com/ph_drinks.htmlIt's interesting to see how most drinks we have are actually acidic. There is also a good quote from the end of that page about the ph scale:"Because the pH scale is logarithmic, a one unit change in pH is associated with a 10 fold change in the acidity. For example, lemon juice has a pH of2.0, while grapefruit juice has a pH of 3.0. Lemon juice would therefore be10x as acidic as grapefruit juice. Even more enlightening, Coke Classic isroughly 100 times as acidic as Barq's root beer."There is also a discussion of how the different acidsin drink...

It would have been a better Instructable with an explanation of what the ph values mean, both generally and in terms of dental health. There is a good table of common drinks ph's shown here:http://www.21stcenturydental.com/ph_drinks.htmlIt's interesting to see how most drinks we have are actually acidic. There is also a good quote from the end of that page about the ph scale:"Because the pH scale is logarithmic, a one unit change in pH is associated with a 10 fold change in the acidity. For example, lemon juice has a pH of2.0, while grapefruit juice has a pH of 3.0. Lemon juice would therefore be10x as acidic as grapefruit juice. Even more enlightening, Coke Classic isroughly 100 times as acidic as Barq's root beer."There is also a discussion of how the different acidsin drinks affect the teeth differently here:http://www.livescience.com/7198-acids-popular-sodas-erode-tooth-enamel.html

The trouble with quantum oscillators is they are working and not working until you actually look at them. I also don't like how they keep disappearing and reappearing again at random. I've started to use Multiverse branded oscillators instead which are made out of a spacially resonant string. Only problem is they are so small they are really difficult to solder and don't even bother looking for one if you drop it.

As a safety device, you've probably increased the potential for danger. Because the safety glasses are on the outside, if you had an impact which caused the mask to move those sharp points around the eye cut-out look like real hazards, waiting to scratch or, even worse, to end up embedded in an eyeball.It would have been safer not to cut out the eye holes but to leave the mesh intact and look through it.

As a safety device, you've probably increase the potential for danger. Because the safety glasses are on the outside, if you had an impact which cause the mask to move those sharp points around the eye cut-out look like real hazards waiting to scratch or even worse to end up embedded in an eyeball.It would have been safer not to cut out the eye holes but to leave the mesh intact and look through it.